3D Visualization And Hazard Assessment Of Landslides Based On GIS

With the continuous changes of global warming,climate deterioration,frequent earthquakes and human activities and other factors,geological hazard activities also occur frequently.Geological hazards restrict the production activities of national economy and the construction of "one belt and one road".Especially when landslide occurs,it has the characteristics of uncertainty,great influence and strong destruction.In this paper,a function module which can calculate the stability coefficient of landslide is designed by using the secondary development of MATLAB,and the most dangerous sliding surface of landslide can be searched out.On this basis,the three-dimensional simulation and risk assessment of landslide can be realized by using ArcScene platform.Determining the stability coefficient and the most dangerous sliding surface of landslide are two main problems in the analysis of landslide stability.In order to solve these two problems,based on the secondary development of MATLAB software,this paper designs an expansion module which can calculate the landslide stability coefficient and visualize the landslide.The module uses object-oriented programming idea and Swedish slice integral method as the core algorithm.It realizes the functions of calculating landslide stability coefficient,determining the most dangerous sliding surface,drawing landslide geometric appearance and outputting sliding arc data.These functions provide powerful support for improving the efficiency of landslide stability analysis and three-dimensional modeling.Based on the analysis of field investigation data,the landslide hazard assessment of giant landslides and their adjacent areas in Jinsha River Basin of Sichuan Province was carried out by using GIS and RS technology.Six landslide influencing factors were considered in the evaluation process.In this paper,analytic hierarchy process(AHP)and interval rough number analytic hierarchy process(IRN-AHP)are used to determine the impact degree of each factor on the occurrence of landslides.Each factor is combined according to the weight value,and finally the landslide risk is obtained.By using ArcGIS software and taking hazard degree aspixel value,the grid map of landslide hazard assessment is made,which can be divided into five grades: low hazard,low hazard,medium hazard,high hazard and high hazard.The ROC curve test results show that the combination of GIS technology and interval rough number analytic hierarchy process has a high accuracy in landslide prediction in this area.